Imaging lens

ABSTRACT

There is provided an imaging lens with excellent optical characteristics which satisfies demand of a low profile and a low F-number. An imaging lens comprises in order from an object side to an image side, a first lens with positive refractive power, a second lens with positive or negative refractive power, a third lens with positive or negative refractive power, a fourth lens, a fifth lens with negative refractive power, a sixth lens with positive refractive power, and a seventh lens with negative refractive power, wherein said first lens has an object-side surface being convex in a paraxial region, said third lens has an object-side surface being convex in a paraxial region, said fifth lens is formed in a biconcave shape having an object-side surface and an image-side surface being concave in a paraxial region, and said seventh lens has an image-side surface being concave in a paraxial region, and predetermined conditional expressions are satisfied.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to an imaging lens which forms an image of an object on a solid-state image sensor such as a CCD sensor or a C-MOS sensor used in an imaging device.

Description of the Related Art

In recent years, it becomes common that camera function is mounted in various products, such as information terminal equipment, home appliances, automobiles, and the like. Development of products with the camera function will be made accordingly.

The imaging lens mounted in such equipment is required to be compact and to have high-resolution performance.

As a conventional imaging lens aiming high performance, for example, the imaging lens disclosed in the following Patent Document 1 has been known.

Patent Document 1 (CN110346903A) discloses an imaging lens comprising, in order from an object side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, and a relationship between a focal length of the first lens and a focal length of the overall optical system, a refractive index of the second lens, a relationship between a focal length of the third lens and a focal length of the fourth lens, a relationship between a paraxial curvature radius of an object-side surface of the seventh lens and a paraxial curvature radius of an image-side surface of the seventh lens, and a refractive index of the fourth lens satisfy a certain condition.

SUMMARY OF THE INVENTION

However, in lens configurations disclosed in the Patent Document 1, when a low profile and a low F-number are to be realized, it is very difficult to correct aberrations at a peripheral area, and excellent optical performance can not be obtained.

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an imaging lens with high resolution which satisfies demand of the low profile and the low F-number in well balance and excellently corrects aberrations.

Regarding terms used in the present invention, “a convex surface (surface being convex)”, “a concave surface (surface being concave)” or “a flat surface (surface being flat)” of lens surfaces implies a shape of the lens surface in a paraxial region (near the optical axis). “Refractive power” implies the refractive power in a paraxial region. “A pole point” implies an off-axial point on an aspheric surface at which a tangential plane intersects the optical axis perpendicularly. “A total track length” is defined as a distance along the optical axis from an object-side surface of an optical element located closest to the object to an image plane. “The total track length” and “a back focus” are distances obtained when thickness of an IR cut filter or a cover glass which may be arranged between the imaging lens and the image plane is converted into an air-converted distance.

An imaging lens according to the present invention comprises, in order from an object side to an image side, a first lens with positive refractive power, a second lens with positive or negative refractive power, a third lens with positive or negative refractive power, a fourth lens, a fifth lens with negative refractive power, a sixth lens with positive refractive power, and a seventh lens with negative refractive power, wherein said first lens has an object-side surface being convex in a paraxial region, said third lens has an object-side surface being convex in a paraxial region, said fifth lens is formed in a biconcave shape having an object-side surface and an image-side surface being concave in a paraxial region, and said seventh lens has an image-side surface being concave in a paraxial region.

The first lens has the positive refractive power and the object-side surface being convex in the paraxial region, and spherical aberration, coma aberration, astigmatism, field curvature, and distortion are suppressed.

The second lens has the positive or negative refractive power. When the second lens has the positive refractive power, the spherical aberration, the astigmatism, the field curvature, and the distortion are properly corrected. When the second lens the negative refractive power, chromatic aberration, the astigmatism, the field curvature, and the distortion are properly corrected. Additionally, when the second lens has at least one aspheric surface, the astigmatism, the field curvature, and the distortion are more properly corrected.

The third lens has the positive or negative refractive power. When the third lens has the positive refractive power, the spherical aberration, the astigmatism, the field curvature, and the distortion are properly corrected. When the third lens the negative refractive power, the chromatic aberration, the astigmatism, the field curvature, and the distortion are properly corrected. Additionally, when the third lens has the object-side surface being convex in the paraxial region, the astigmatism, the field curvature, and the distortion are more properly corrected.

The fourth lens has at least one aspheric surface, and the astigmatism, the field curvature, and the distortion are properly corrected.

The fifth lens is formed in a biconcave shape having the object-side surface and the image-side surface being concave in a paraxial region, and the chromatic aberration, coma aberration, the astigmatism, and the distortion are suppressed.

The sixth lens has the positive refractive power and at least one aspheric surface, and the spherical aberration, the coma aberration, the astigmatism, the field curvature, and the distortion are suppressed.

The seventh lens has the negative refractive power and at least one aspheric surface, and the chromatic aberration, the astigmatism, the field curvature, and the distortion are properly corrected. Furthermore, the seventh lens has the image-side surface being concave in the paraxial region, and maintains a low profile and secures a back focus.

According to the imaging lens having the above-described configuration, it is preferable that an image-side surface of the third lens is concave in the paraxial region.

When the image-side surface of the third lens is concave in the paraxial region, the astigmatism, the field curvature, and the distortion can be properly corrected.

According to the imaging lens having the above-described configuration, it is preferable that an object-side surface of the sixth lens is formed as an aspheric surface having at least one pole point in a position off the optical axis.

When the object-side surface of the sixth lens is formed as an aspheric surface having at least one pole point in a position off the optical axis, the astigmatism, the field curvature, and the distortion can be more properly corrected.

According to the imaging lens having the above-described configuration, it is preferable that an image-side surface of the sixth lens is formed as an aspheric surface having at least one pole point in a position off the optical axis.

When the image-side surface of the sixth lens is formed as an aspheric surface having at least one pole point in a position off the optical axis, the astigmatism, the field curvature, and the distortion can be more properly corrected.

According to the imaging lens having the above-described configuration, it is preferable that an image-side surface of the seventh lens is formed as an aspheric surface having at least one pole point in a position off the optical axis.

When the image-side surface of the seventh lens is formed as an aspheric surface having at least one pole point in a position off the optical axis, the astigmatism, the field curvature, and the distortion can be more properly corrected.

The imaging lens according to the present invention, due to the above-mentioned configuration, achieves a low profile which a ratio of a total track length to a diagonal length of an effective image area of the image sensor is 0.7 or less and a low F number of 2.0 or less.

According to the imaging lens having the above-described configuration, it is preferable that the following conditional expression (1) is satisfied:

13.00<vd3<34.00  (1)

where vd3: an abbe number at d-ray of the third lens.

The conditional expression (1) defines an appropriate range of the abbe number at d-ray of the third lens. By satisfying the conditional expression (1), the chromatic aberration can be properly corrected.

According to the imaging lens having the above-described configuration, it is preferable that the following conditional expression (2) is satisfied:

0.55<(vd2/vd4)×(vd5/vd6)<1.30  (2)

where vd2: an abbe number at d-ray of the second lens, vd4: an abbe number at d-ray of the fourth lens, vd5: an abbe number at d-ray of the fifth lens, and vd6: an abbe number at d-ray of the sixth lens.

The conditional expression (2) defines an appropriate range of a relationship among the abbe number at d-ray of the second lens, the abbe number at d-ray of the fourth lens, the abbe number at d-ray of the fifth lens and the abbe number at d-ray of the sixth lens. By satisfying the conditional expression (2), the chromatic aberration can be properly corrected.

According to the imaging lens having the above-described configuration, it is preferable that the following conditional expression (3) is satisfied:

1.50<r12/(T5+D6)<14.00  (3)

where r12: a paraxial curvature radius of an image-side surface of the sixth lens, T5: a distance along the optical axis from an image-side surface of the fifth lens to an object-side surface of the sixth lens, and D6: a thickness along the optical axis of the sixth lens.

The conditional expression (3) defines an appropriate range of a relationship among the paraxial curvature radius of the image-side surface of the sixth lens, the distance along the optical axis from the image-side surface of the fifth lens to the object-side surface of the sixth lens, and the thickness along the optical axis of the sixth lens. By satisfying the conditional expression (3), reduction in a profile can be achieved, and the coma aberration, the astigmatism, the field curvature, and the distortion can be properly corrected.

According to the imaging lens having the above-described configuration, it is preferable that the following conditional expression (4) is satisfied:

2.50<(D1/f1)×100<16.20  (4)

where D1: a thickness along the optical axis of the first lens, and f1: a focal length of the first lens.

The conditional expression (4) defines an appropriate range of a relationship between the thickness along the optical axis of the first lens and the focal length of the first lens. By satisfying the conditional expression (4), reduction in the profile can be achieved, and the spherical aberration, the coma aberration, the astigmatism, the field curvature, and the distortion can be properly corrected.

According to the imaging lens having the above-described configuration, it is preferable that the following conditional expression (5) is satisfied:

−1.75<f1/f7<−0.50  (5)

where f1: a focal length of the first lens, and f7: a focal length of the seventh lens.

The conditional expression (5) defines an appropriate range of a relationship between the focal length of the first lens and the focal length of the seventh lens. By satisfying the conditional expression (5), the coma aberration, the astigmatism, the field curvature, and the distortion can be properly corrected.

According to the imaging lens having the above-described configuration, it is preferable that the following conditional expression (6) is satisfied:

−4.65<f3/f2<−0.25  (6)

where f3: a focal length of the third lens, and f2: a focal length of the second lens.

The conditional expression (6) defines an appropriate range of a relationship between the focal length of the third lens and the focal length of the second lens. By satisfying the conditional expression (6), the astigmatism, the field curvature, and the distortion can be properly corrected.

According to the imaging lens having the above-described configuration, it is preferable that the following conditional expression (7) is satisfied:

−2.75<r9/f<−0.20  (7)

where r9: a paraxial curvature radius of an object-side surface of the fifth lens, and f: a focal length of the overall optical system of the imaging lens.

The conditional expression (7) defines an appropriate range of the paraxial curvature radius of the object-side surface of the fifth lens. By satisfying the conditional expression (7), the astigmatism and the distortion can be properly corrected.

According to the imaging lens having the above-described configuration, it is preferable that the following conditional expression (8) is satisfied:

0.80<r12/f6<1.90  (8)

where r12: a paraxial curvature radius of an image-side surface of the sixth lens, and f6: a focal length of the sixth lens.

The conditional expression (8) defines an appropriate range of a relationship between the paraxial curvature radius of the image-side surface of the sixth lens and the focal length of the sixth lens. By satisfying the conditional expression (8), the coma aberration, the astigmatism, the field curvature, and the distortion can be properly corrected.

According to the imaging lens having the above-described configuration, it is preferable that the following conditional expression (9) is satisfied:

8.00<(D6/f6)×100  (9)

where D6: a thickness along the optical axis of the sixth lens, and f6: a focal length of the sixth lens.

The conditional expression (9) defines an appropriate range of a relationship between the thickness along the optical axis of the sixth lens and the focal length of the sixth lens. By satisfying the conditional expression (9), reduction in the profile can be achieved, and the coma aberration, the astigmatism, the field curvature, and the distortion can be properly corrected.

According to the imaging lens having the above-described configuration, it is preferable that the following conditional expression (10) is satisfied:

0.20<f1/f<2.20  (10)

where f1: a focal length of the first lens, and f: a focal length of the overall optical system of the imaging lens.

The conditional expression (10) defines an appropriate range of the focal length of the first lens. By satisfying the conditional expression (10), reduction in the profile can be achieved, and the spherical aberration, the coma aberration, the astigmatism, the field curvature, and the distortion can be properly corrected.

According to the imaging lens having the above-described configuration, it is preferable that the following conditional expression (11) is satisfied:

−6.00<f5/f<−0.50  (11)

where f5: a focal length of the fifth lens, and f: a focal length of the overall optical system of the imaging lens.

The conditional expression (11) defines an appropriate range of the focal length of the fifth lens. By satisfying the conditional expression (11), the chromatic aberration, the coma aberration, the astigmatism, and the distortion can be properly corrected.

According to the imaging lens having the above-described configuration, it is preferable that the following conditional expression (12) is satisfied:

0.40<f6/f<1.65  (12)

where f6: a focal length of the sixth lens, and f: a focal length of the overall optical system of the imaging lens.

The conditional expression (12) defines an appropriate range of the focal length of the sixth lens. By satisfying the conditional expression (12), reduction in the profile can be achieved, and the spherical aberration, the coma aberration, the astigmatism, the field curvature, and the distortion can be properly corrected.

According to the imaging lens having the above-described configuration, it is preferable that the following conditional expression (13) is satisfied:

−1.90<f7/f<−0.30  (13)

where f7: a focal length of the seventh lens, and f: a focal length of the overall optical system of the imaging lens.

The conditional expression (13) defines an appropriate range of the focal length of the seventh lens. By satisfying the conditional expression (13), the chromatic aberration, the astigmatism, the field curvature, and the distortion can be properly corrected.

According to the imaging lens having the above-described configuration, it is preferable that the following conditional expression (14) is satisfied:

0.40<f1/f6<2.90  (14)

where f1: a focal length of the first lens, and f6: a focal length of the sixth lens.

The conditional expression (14) defines an appropriate range of a relationship between the focal length of the first lens and the focal length of the sixth lens. By satisfying the conditional expression (14), the spherical aberration, the coma aberration, the astigmatism, the field curvature, and the distortion can be properly corrected.

According to the imaging lens having the above-described configuration, it is preferable that the following conditional expression (15) is satisfied:

−1.15<f3/f2/f1<−0.08  (15)

where f3: a focal length of the third lens, f2: a focal length of the second lens, and f1: a focal length of the first lens.

The conditional expression (15) defines an appropriate range of a relationship among the focal length of the third lens, the focal length of the second lens, and the focal length of the first lens. By satisfying the conditional expression (15), the spherical aberration, the coma aberration, the astigmatism, the field curvature, and the distortion can be properly corrected.

According to the imaging lens having the above-described configuration, it is preferable that the following conditional expression (16) is satisfied:

0.10<r1/f<0.55  (16)

where r1: a paraxial curvature radius of an object-side surface of the first lens, and f: a focal length of the overall optical system of the imaging lens.

The conditional expression (16) defines an appropriate range of the paraxial curvature radius of the object-side surface of the first lens. By satisfying the conditional expression (16), the spherical aberration, the coma aberration, the field curvature, and the distortion can be properly corrected.

According to the imaging lens having the above-described configuration, it is preferable that the following conditional expression (17) is satisfied:

6.00<r2/D1<13.00  (17)

where r2: a paraxial curvature radius of an image-side surface of the first lens, and D1: a thickness along the optical axis of the first lens.

The conditional expression (17) defines an appropriate range of a relationship between the paraxial curvature radius of the image-side surface of the first lens and the thickness along the optical axis of the first lens. By satisfying the conditional expression (17), reduction in the profile can be achieved, and the astigmatism and the distortion can be properly corrected.

According to the imaging lens having the above-described configuration, it is preferable that the following conditional expression (18) is satisfied:

r9/T4<−10.50  (18)

where r9: a paraxial curvature radius of an object-side surface of the fifth lens, and T4: a distance along the optical axis from an image-side surface of the fourth lens to an object-side surface of the fifth lens.

The conditional expression (18) defines an appropriate range of a relationship between the paraxial curvature radius of the object-side surface of the fifth lens and the distance along the optical axis from the image-side surface of the fourth lens to the object-side surface of the fifth lens. By satisfying the conditional expression (18), reduction in the profile can be achieved, and the astigmatism and the distortion can be properly corrected.

According to the imaging lens having the above-described configuration, it is preferable that the following conditional expression (19) is satisfied:

1.00<r10/f<51.00  (19)

where r10: a paraxial curvature radius of an image-side surface of the fifth lens, and f: a focal length of the overall optical system of the imaging lens.

The conditional expression (19) defines an appropriate range of the paraxial curvature radius of the image-side surface of the fifth lens. By satisfying the conditional expression (19), the coma aberration, the astigmatism, and the distortion can be properly corrected.

According to the imaging lens having the above-described configuration, it is preferable that the following conditional expression (20) is satisfied:

1.50<r11/T6<7.50  (20)

where r11: a paraxial curvature radius of an object-side surface of the sixth lens, and T6: a distance along the optical axis from an image-side surface of the sixth lens to an object-side surface of the seventh lens.

The conditional expression (20) defines an appropriate range of a relationship between the paraxial curvature radius of the object-side surface of the sixth lens and the distance along the optical axis from the image-side surface of the sixth lens to the object-side surface of the seventh lens. By satisfying the conditional expression (20), reduction in the profile can be achieved, and the astigmatism, the field curvature, and the distortion can be properly corrected.

According to the imaging lens having the above-described configuration, it is preferable that the following conditional expression (21) is satisfied:

0.35<r11/f6<1.00  (21)

where r11: a paraxial curvature radius of an object-side surface of the sixth lens, and f6: a focal length of the sixth lens.

The conditional expression (21) defines an appropriate range of a relationship between the paraxial curvature radius of the object-side surface of the sixth lens and the focal length of the sixth lens. By satisfying the conditional expression (21), reduction in the profile can be achieved, and the spherical aberration, the coma aberration, the astigmatism, the field curvature, and the distortion can be properly corrected.

According to the imaging lens having the above-described configuration, it is preferable that the following conditional expression (22) is satisfied:

1.00<r12/(D5+T5+D6)<8.60  (22)

where r12: a paraxial curvature radius of an image-side surface of the sixth lens, D5: a thickness along the optical axis of the fifth lens, T5: a distance along the optical axis from an image-side surface of the fifth lens to an object-side surface of the sixth lens, and D6: a thickness along the optical axis of the sixth lens.

The conditional expression (22) defines an appropriate range of a relationship among the paraxial curvature radius of the image-side surface of the sixth lens, the thickness along the optical axis of the fifth lens, the distance along the optical axis from the image-side surface of the fifth lens to the object-side surface of the sixth lens, and the thickness along the optical axis of the sixth lens. By satisfying the conditional expression (22), reduction in the profile can be achieved, and the coma aberration, the astigmatism, the field curvature, and the distortion can be properly corrected.

Effect of Invention

According to the present invention, there can be provided an imaging lens with high resolution which satisfies demand of the low profile and the low F-number in well balance, and properly corrects aberrations.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view showing an imaging lens in Example 1 according to the present invention.

FIG. 2 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 1 according to the present invention.

FIG. 3 is a schematic view showing an imaging lens in Example 2 according to the present invention.

FIG. 4 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 2 according to the present invention.

FIG. 5 is a schematic view showing an imaging lens in Example 3 according to the present invention.

FIG. 6 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 3 according to the present invention.

FIG. 7 is a schematic view showing an imaging lens in Example 4 according to the present invention.

FIG. 8 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 4 according to the present invention.

FIG. 9 is a schematic view showing an imaging lens in Example 5 according to the present invention.

FIG. 10 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 5 according to the present invention.

FIG. 11 is a schematic view showing an imaging lens in Example 6 according to the present invention.

FIG. 12 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 6 according to the present invention.

FIG. 13 is a schematic view showing an imaging lens in Example 7 according to the present invention.

FIG. 14 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 7 according to the present invention.

FIG. 15 is a schematic view showing an imaging lens in Example 8 according to the present invention.

FIG. 16 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 8 according to the present invention.

FIG. 17 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 9 according to the present invention.

FIG. 18 is a schematic view showing an imaging lens in Example 9 according to the present invention.

FIG. 19 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 10 according to the present invention.

FIG. 20 is a schematic view showing an imaging lens in Example 10 according to the present invention.

FIG. 21 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 11 according to the present invention.

FIG. 22 is a schematic view showing an imaging lens in Example 11 according to the present invention.

FIG. 23 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 12 according to the present invention.

FIG. 24 is a schematic view showing an imaging lens in Example 12 according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Hereinafter, the preferred embodiment of the present invention will be described in detail referring to the accompanying drawings.

FIGS. 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21 and 23 are schematic views of the imaging lenses in Examples 1 to 12 according to the embodiments of the present invention, respectively.

The imaging lens according to the present invention comprises, in order from an object side to an image side, a first lens L1 with positive refractive power, a second lens L2 with positive or negative refractive power, a third lens L3 with positive or negative refractive power, a fourth lens L4, a fifth lens L5 with negative refractive power, a sixth lens L6 with positive refractive power, and a seventh lens L7 with negative refractive power, wherein said first lens L1 has an object-side surface being convex in a paraxial region, said third lens L3 has an object-side surface being convex in a paraxial region, said fifth lens L5 is formed in a biconcave shape having an object-side surface and an image- side surface being concave in a paraxial region, and said seventh lens L7 has an image-side surface being concave in a paraxial region.

A filter IR such as an IR cut filter or a cover glass is arranged between the seventh lens L7 and an image plane IMG (namely, the image plane of an image sensor). The filter IR is omissible.

By arranging an aperture stop ST on the object side of the first lens L1, correction of aberrations and control of an incident angle of the light ray of high image height to an image sensor become facilitated. A position of the aperture stop ST is not limited to the object side of the first lens L1. The aperture stop ST may be appropriately arranged according to a specification of the image sensor.

The first lens L1 has the positive refractive power and is formed in a meniscus shape having the object-side surface being convex and an image-side surface being concave in the paraxial region (near the optical axis X). Therefore, spherical aberration, coma aberration, astigmatism, field curvature, and distortion are suppressed.

The second lens L2 has the negative refractive power and is formed in a meniscus shape having an object-side surface being convex and an image-side surface being concave in the paraxial region. Therefore, chromatic aberration, the astigmatism, the field curvature, and the distortion are properly corrected.

Refractive power of the second lens L2 may be positive as in Examples 3, 4, 5, 6, 7, 8, 9, 10 and 11 shown in FIGS. 5, 7, 9, 11, 13, 15, 17, 19 and 21. In this case, the second lens L2 having the positive refractive power is favorable for correction of the spherical aberration, the astigmatism, the field curvature, and the distortion.

A shape of the second lens L2 may be a biconvex shape having the object-side surface and the image-side surface being both convex in the paraxial region as in Examples 3, 4, 5, 6, 7, 8, 9, 10 and 11 shown in FIGS. 5, 7, 9, 11, 13, 15, 17, 19 and 21. In this case, positive refractive powers on both surfaces of the second lens L2 is favorable for reduction in a profile.

The third lens L3 has the positive refractive power and is formed in a meniscus shape having the object-side surface being convex and an image-side surface being concave in the paraxial region. Therefore, the spherical aberration, the astigmatism, the field curvature, and the distortion are properly corrected.

Refractive power of the third lens L3 may be negative as in Examples 3, 4, 5, 6, 7, 8, 9, 10 and 11 shown in FIGS. 5, 7, 9, 11, 13, 15, 17, 19 and 21. In this case, the third lens L3 having the negative refractive power is favorable for correction of the chromatic aberration, the astigmatism, the field curvature, and the distortion.

The fourth lens L4 substantially has no refractive power, and is formed in a shape having an object-side surface and an image-side surface which are both flat in a paraxial region. Therefore, the astigmatism, the field curvature, and the distortion are properly corrected by aspheric surfaces formed on both sides without affecting a focal length of the overall optical system of the imaging lens.

Refractive power of the fourth lens L4 may be positive as in Examples 3, 4, 5, 6, 7, 8, 9, 10 and 11 shown in FIGS. 5, 7, 9, 11, 13, 15, 17, 19 and 21. In this case, the fourth lens L4 having the positive refractive power is favorable for correction of the spherical aberration, the astigmatism, the field curvature, and the distortion. Furthermore, the refractive power of the fourth lens L4 may be negative as in Example 12 shown in FIG. 23. In this case, the fourth lens L4 having the negative refractive power is favorable for correction of the chromatic aberration, the astigmatism, the field curvature, and the distortion.

A shape of the fourth lens L4 may be a meniscus shape having the object-side surface being concave and the image-side surface being convex in the paraxial region as in Examples 3, 4, 5, 6, 8, 9, 10 and 11 shown in FIGS. 5, 7, 9, 11, 15, 17, 19 and 21. In this case, the astigmatism, the field curvature, and the distortion can be properly corrected. Furthermore, the shape of the fourth lens L4 may be a biconvex shape having the object-side surface and the image-side surface being both convex as in Example 7 shown in FIG. 13. In this case, the fourth lens L4 formed in the biconvex shape is favorable for reduction in the profile due to the positive refractive powers on both surfaces. Additionally, the shape of the fourth lens L4 may be a meniscus shape having the object-side surface being convex and the image-side surface being concave in the paraxial region. In this case, the astigmatism, the field curvature, and the distortion can be properly corrected.

The fifth lens L5 has the negative refractive power, and is formed in a biconcave shape having an object-side surface and an image-side surface being both concave in a paraxial region. Therefore, the chromatic aberration, the coma aberration, the astigmatism, and the distortion are properly corrected.

The sixth lens L6 has the positive refractive power, and is formed in a meniscus shape having an object-side surface being convex and the image-side surface being concave in a paraxial region. Therefore, the spherical aberration, the coma aberration, the astigmatism, the field curvature, and the distortion are properly corrected.

The object-side surface of the sixth lens L6 is formed as an aspheric surface having at least one pole point in a position off the optical axis X. Therefore, the astigmatism, the field curvature, and the distortion are more properly corrected.

The image-side surface of the sixth lens L6 is formed as an aspheric surface having at least one pole point in a position off the optical axis X. Therefore, the astigmatism, the field curvature, and the distortion are more properly corrected.

The seventh lens L7 has the negative refractive power, and is formed in a biconcave shape having an object-side surface and the image-side surface being both concave in a paraxial region. Therefore, the chromatic aberration, the astigmatism, the field curvature, and the distortion are properly corrected. Furthermore, providing the image-side surface being concave in the paraxial region, a back focus is secured while maintaining the low profile.

A shape of the seventh lens L7 may be a meniscus shape having the object-side surface being convex and the image-side surface being concave in the paraxial region as in Examples 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12 shown in FIGS. 3, 5, 7, 9, 11, 13, 15, 17, 19, 21 and 23. In this case, the astigmatism, the field curvature, and the distortion can be properly corrected.

The image-side surface of the seventh lens L7 is formed as an aspheric surface having at least one pole point in a position off the optical axis X. Therefore, the astigmatism, the field curvature, and the distortion are more properly corrected.

Regarding the imaging lens according to the present embodiments, it is preferable that all lenses of the first lens L1 to the seventh lens L7 are single lenses. Configuration only with the single lenses can frequently use the aspheric surfaces. In the present embodiments, all lens surfaces are formed as appropriate aspheric surfaces, and the aberrations are properly corrected. Furthermore, in comparison with the case in which a cemented lens is used, workload is reduced, and manufacturing in low cost becomes possible.

Furthermore, the imaging lens according to the present embodiments makes manufacturing facilitated by using a plastic material for the lenses, and mass production in a low cost can be realized.

The material applied to the lens is not limited to the plastic material. By using glass material, further high performance may be aimed. It is preferable that all of lens-surfaces are formed as aspheric surfaces, however, spherical surfaces easy to be manufactured may be adopted in accordance with required performance.

The imaging lens according to the present embodiments shows preferable effects by satisfying the following conditional expressions (1) to (22),

13.00<vd3<34.00  (1)

0.55<(vd2/vd4)×(vd5/vd6)<1.30  (2)

1.50<r12/(T5+D6)<14.00  (3)

2.50<(D1/f1)×100<16.20  (4)

−1.75<f1/f7<−0.50  (5)

−4.65<f3/f2<−0.25  (6)

−2.75<r9/f<−0.20  (7)

0.80<r12/f6<1.90  (8)

8.00<(D6/f6)×100  (9)

0.20<f1/f<2.20  (10)

−6.00<f5/f<−0.50  (11)

0.40<f6/f<1.65  (12)

−1.90<f7/f<−0.30  (13)

0.40<f1/f6<2.90  (14)

−1.15<f3/f2/f1<−0.08  (15)

0.10<r1/f<0.55  (16)

6.00<r2/D1<13.00  (17)

r9/T4<−10.50  (18)

1.00<r10/f<51.00  (19)

1.50<r11/T6<7.50  (20)

0.35<r11/f6<1.00  (21)

1.00<r12/(D5+T5+D6)<8.60  (22)

where vd2: an abbe number at d-ray of the second lens L2, vd3: an abbe number at d-ray of the third lens L3, vd4: an abbe number at d-ray of the fourth lens L4, vd5: an abbe number at d-ray of the fifth lens L5, vd6: an abbe number at d-ray of the sixth lens L6, D1: a thickness along the optical axis X of the first lens L1, D5: a thickness along the optical axis X of the fifth lens L5, D6: a thickness along the optical axis X of the sixth lens L6, T4: a distance along the optical axis X from an image-side surface of the fourth lens L4 to an object-side surface of the fifth lens L5, T5: a distance along the optical axis X from an image-side surface of the fifth lens L5 to an object-side surface of the sixth lens L6, T6: a distance along the optical axis X from an image-side surface of the sixth lens L6 to an object-side surface of the seventh lens L7, f: a focal length of the overall optical system of the imaging lens, f1: a focal length of the first lens L1, f2: a focal length of the second lens L2, f3: a focal length of the third lens L3, f5: a focal length of the fifth lens L5, f6: a focal length of the sixth lens L6, f7: a focal length of the seventh lens L7, r1: a paraxial curvature radius of an object-side surface of the first lens L1, r2: a paraxial curvature radius of an image-side surface of the first lens L1, r9: a paraxial curvature radius of an object-side surface of the fifth lens L5, r10: a paraxial curvature radius of an image-side surface of the fifth lens L5, r11: a paraxial curvature radius of an object-side surface of the sixth lens L6, and r12: a paraxial curvature radius of an image-side surface of the sixth lens L6,

It is not necessary to satisfy the above all conditional expressions. An operational advantage corresponding to each conditional expression can be obtained by satisfying the conditional expression individually.

The imaging lens according to the present embodiments shows further preferable effects by satisfying the following conditional expressions (1a) to (22a),

16.00<vd3<29.50  (1a)

0.70<(vd2/vd4)×(vd5/vd6)<1.15  (2a)

4.00<r12/(T5+D6)<13.25  (3a)

4.00<(D1/f1)×100<16.20  (4a)

−1.65<f1/f7<−0.85  (5a)

−4.65<f3/f2<−0.80  (6a)

−2.75<r9/f<−0.60  (7a)

1.00<r12/f6<1.87  (8a)

8.50<(D6/f6)×100<50.00  (9a)

0.60<f1/f<2.00  (10a)

−5.00<f5/f<−0.90  (11a)

0.75<f6/f<1.35  (12a)

−1.75<f7/f<−0.60  (13a)

0.65<f1/f6<2.40  (14a)

−0.95<f3/f2/f1<−0.10  (15a)

0.25<r1/f<0.50  (16a)

7.00<r2/D1<11.00  (17a)

−200.00<r9/T4<−11.50  (18a)

2.00<r10/f<40.00  (19a)

2.40<r11/T6<6.00  (20a)

0.40<r11/f6<0.75  (21a)

3.00<r12/(D5+T5+D6)<8.20.  (22a)

The signs in the above conditional expressions have the same meanings as those in the paragraph before the preceding paragraph. Additionally, only lower limits or upper limits of the conditional expressions (1a) to (22a) may be applied to the corresponding conditional expressions (1) to (22).

In this embodiment, the aspheric shapes of the aspheric surfaces of the lens are expressed by Equation 1, where Z denotes an axis in the optical axis direction, H denotes a height perpendicular to the optical axis, R denotes a paraxial curvature radius, k denotes a conic constant, and A4, A6, A8, A10, Al2, A14, A16, A18 and A20 denote aspheric surface coefficients.

$\begin{matrix} {Z = {\frac{\frac{H^{2}}{R}}{1 + \sqrt{1 - {\left( {k + 1} \right)\frac{H^{2}}{R^{2}}}}} + {A_{4}H^{4}} + {A_{6}H^{6}} + {A_{8}H^{8}} + {A_{10}H^{10}} + {A_{12}H^{12}} + {A_{14}H^{14}} + {A_{16}H^{16}} + {A_{18}H^{18}} + {A_{20}H^{20}}}} & \left\lbrack {{Equation}\mspace{14mu} 1} \right\rbrack \end{matrix}$

Next, examples of the imaging lens according to this embodiment will be explained. In each example, f denotes a focal length of the overall optical system of the imaging lens, Fno denotes an F-number, ω denotes a half field of view, ih denotes a maximum image height, and TTL denotes a total track length. Additionally, i denotes a surface number counted from the object side, r denotes a paraxial curvature radius, d denotes a distance of lenses along the optical axis (surface distance), Nd denotes a refractive index at d-ray (reference wavelength), and vd denotes an abbe number at d-ray. As for aspheric surfaces, an asterisk (*) is added after surface number i.

Example 1

The basic lens data is shown below in Table 1.

TABLE1 Example 1 Unit mm f = 6.66 Fno = 1.88 ω(°) = 42.0 h = 6.13 TTL = 7.79 Surface Data i r d Nd νd (Object) Infinity Infinity  1 (Stop) Infinity −0.7053  2* 2.5206 0.9859 1.535 55.69 (νd1)  3* 9.6455 0.0781  4* 8.2886 0.3091 1.671 19.24 (νd2)  5* 4.9528 0.5817  6* 20.8810 0.5752 1.614 25.59 (νd3)  7* 33.5986 0.4065  8* Infinity 0.3902 1.671 19.24 (νd4)  9* Infinity 0.2027 10* −17.4616 0.5892 1.535 55.69 (νd5) 11* 67.6277 0.3929 12* 2.9222 0.6341 1.535 55.69 (νd6) 13* 12.6537 0.7929 14* −1936.7740 0.7421 1.535 55.69 (νd7) 15* 2.7652 0.5000 16 Infinity 0.1100 1.517 64.20 17 Infinity 0.5354 nage Plane Constituent Lens Data Lens Start Surface Focal Length TTL to diagonal length of effective image area 1 2 6.087 0.64 2 4 −19.057 3 6 88.294 4 8 Infinity 5 10 −25.887 6 12 6.947 7 14 −5.162 Aspheric Surface Data 2nd Surface 3rd Surface 4th Surface 5th Surface 6th Surface 7th Surface 8th Surface k −6.825494E−02   3.701020E+00   5.366851E+00 −1.609250E+01   0.000000E+00   0.000000E+00 −1.097418E+00 A4 −3.666225E−03 −2.982146E−02 −4.689576E−02 −1.279322E−03 −1.423798E−02 −2.414228E−02   1.658572E−02 A6   1.293219E−02   1.476010E−02   4.052261E−02   9.250885E−03 −1.355486E−02   1.954532E−02 −8.157106E−02 A8 −1.648789E−02   2.313426E−03 −2.710583E−02   1.340434E−02   1.306790E−02 −4.250797E−02   9.471036E−02 A10   1.293742E−02 −6.895891E−03   2.009036E−02 −3.718059E−02   3.382566E−04   4.547569E−02 −7.354169E−02 A12 −6.473512E−03   4.028680E−03 −1.310357E−02   4.420092E−02 −1.329402E−02 −2.839978E−02   3.830973E−02 A14   2.107314E−03 −1.238069E−03   5.933147E−03 −3.002339E−02   1.248362E−02   1.028925E−02 −1.336957E−02 A16 −4.346256E−04   2.201965E−04 −1.646974E−03   1.201477E−02 −5.394638E−03 −2.017208E−03   2.986841E−03 A18   5.173980E−05 −2.208735E−05   2.529019E−04 −2.637199E−03   1.156903E−03   1.657829E−04 −3.843074E−04 A20 −2.758615E−06   1.011887E−06 −1.641826E−05   2.486972E−04 −9.651455E−05   5.743535E−07   2.133908E−05 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface 14th Surface 15th Surface k −9.216925E−01   2.021054E+01 −6.860556E+01 −1.015902E+00 −1.171680E+01   0.000000E+00 −8.069369E+00 A4   3.650677E−02   1.159064E−02 −6.983476E−02 −2.702225E−02   3.348888E−02 −6.818329E−02 −3.550945E−02 A6 −6.650039E−02 −2.243617E−02   2.172579E−02   1.737395E−03 −1.382476E−02   2.166775E−02   9.528515E−03 A8   4.541327E−02   1.009628E−02 −6.118834E−03 −1.082135E−03   2.419161E−03 −3.801811E−03 −1.728545E−03 A10 −1.973301E−02 −2.253857E−03   1.680203E−03   2.473872E−04 −2.592724E−04   4.257388E−04   2.036269E−04 A12   5.601128E−03   2.970727E−04 −3.068018E−04 −2.463149E−05   1.813202E−05 −3.142442E−05 −1.560183E−05 A14 −1.000956E−03 −2.401095E−05   3.356234E−05   1.268286E−06 −8.040452E−07   1.523783E−06   7.657107E−07 A16   1.044017E−04   1.166510E−06 −2.138193E−06 −3.393020E−08   2.025767E−08 −4.674695E−08 −2.305673E−08 A18 −5.426541E−06 −3.156313E−08   7.345281E−08   4.094583E−10 −2.137395E−10   8.224591E−10   3.861347E−10 A20   8.916627E−08   3.760948E−10 −1.055786E−09 −1.331540E−12 −1.843651E−13 −6.315137E−12 −2.745491E−12

The imaging lens in Example 1 achieves a ratio of a total track length to a diagonal length of an effective image area of the image sensor of 0.64, and a F number of 1.88. As shown in Table 13, the imaging lens in Example 1 satisfies the conditional expressions (1) to (22).

FIG. 2 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 1. The spherical aberration diagram shows the amount of aberration at each wavelength of F-ray (486 nm), d-ray (588 nm), and C-ray (656 nm). The astigmatism diagram shows the amount of aberration at d-ray on a sagittal image surface S (solid line) and the amount of aberration at d-ray on tangential image surface T (broken line), respectively (same as FIGS. 4, 6, 8, 10, 12, 14, 16, 18, 20, 22 and 24). As shown in FIG. 2, each aberration is corrected excellently.

Example 2

The basic lens data is shown below in Table 2.

TABLE2 Example 2 Unit mm f = 6.56 Fno = 1.88 ω(°) = 42.4 h = 6.13 TTL = 7.72 Surface Data i r d Nd νd (Object) Infinity Infinity  1 (Stop) Infinity −0.6751  2* 2.5160 0.9607 1.535 55.69 (νd1)  3* 9.5376 0.0769  4* 8.2730 0.3065 1.671 19.24 (νd2)  5* 4.9805 0.5780  6* 21.0989 0.5732 1.639 23.52 (νd3)  7* 34.6805 0.4062  8* Infinity 0.3805 1.671 19.24 (νd4)  9* Infinity 0.2070 10* −17.6218 0.5904 1.535 55.69 (νd5) 11* 69.3530 0.3598 12* 2.8996 0.6192 1.535 55.69 (νd6) 13* 12.5789 0.7743 14* 285.0821 0.7442 1.535 55.69 (νd7) 15* 2.8211 0.5000 16 Infinity 0.1100 1.517 64.20 17 Infinity 0.5743 nage Plane Constituent Lens Data Lens Start Surface Focal Length TTL to diagonal length of effective image area 1 2 6.100 0.63 2 4 −19.381 3 6 82.927 4 8 Infinity 5 10 −26.212 6 12 6.892 7 14 −5.332 Aspheric Surface Data 2nd Surface 3rd Surface 4th Surface 5th Surface 6th Surface 7th Surface 8th Surface k −6.840266E−02   3.720297E+00   5.392084E+00 −1.620463E+01   0.000000E+00   0.000000E+00 −1.097411E+00 A4 −3.614648E−03 −3.022128E−02 −4.677232E−02 −2.647820E−03 −1.386704E−02 −2.420606E−02   1.459178E−02 A6   1.284345E−02   1.507355E−02   4.052170E−02   1.060948E−02 −1.355909E−02   1.963391E−02 −7.910773E−02 A8 −1.650466E−02   2.169403E−03 −2.709420E−02   1.273534E−02   1.304335E−02 −4.243158E−02   9.353751E−02 A10   1.293458E−02 −6.920066E−03   2.009815E−02 −3.723349E−02   3.480446E−04   4.546823E−02 −7.349841E−02 A12 −6.474139E−03   4.036076E−03 −1.310030E−02   4.430654E−02 −1.328045E−02 −2.840489E−02   3.824252E−02 A14   2.107104E−03 −1.234824E−03   5.934170E−03 −2.999120E−02   1.249208E−02   1.028947E−02 −1.328328E−02 A16 −4.347032E−04   2.200466E−04 −1.646818E−03   1.200050E−02 −5.393651E−03 −2.016565E−03   2.971055E−03 A18   5.170071E−05 −2.249134E−05   2.528877E−04 −2.649372E−03   1.159665E−03   1.661986E−04 −3.876401E−04 A20 −2.775596E−06   1.042088E−06 −1.646114E−05   2.534386E−04 −9.767244E−05   6.586052E−07   2.208223E−05 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface 14th Surface 15th Surface k −9.217163E−01   2.035364E+01   0.000000E+00 −1.015271E+00 −1.167016E+01   0.000000E+00 −8.534696E+00 A4   3.740889E−02   1.149336E−02 −7.055046E−02 −2.728806E−02   3.321280E−02 −6.847429E−02 −3.552604E−02 A6 −6.681273E−02 −2.245977E−02   2.181306E−02   1.745605E−03 −1.382082E−02   2.166918E−02   9.524208E−03 A8   4.539790E−02   1.009498E−02 −6.117815E−03 −1.081323E−03   2.419262E−03 −3.801549E−03 −1.728724E−03 A10 −1.973295E−02 −2.253762E−03   1.679980E−03   2.474102E−04 −2.592460E−04   4.257443E−04   2.036258E−04 A12   5.601242E−03   2.971196E−04 −3.068209E−04 −2.463176E−05   1.813305E−05 −3.142447E−05 −1.560173E−05 A14 −1.000970E−03 −2.401025E−05   3.356292E−05   1.268196E−06 −8.040351E−07   1.523771E−06   7.657150E−07 A16   1.043860E−04   1.167165E−06 −2.138030E−06 −3.393399E−08   2.025658E−08 −4.674747E−08 −2.305663E−08 A18 −5.429864E−06 −3.166609E−08   7.346197E−08   4.090588E−10 −2.137944E−10   8.224522E−10   3.861371E−10 A20   8.963378E−08   3.773506E−10 −1.057438E−09 −1.299859E−12 −1.848109E−13 −6.314240E−12 −2.745359E−12

The imaging lens in Example 2 achieves a ratio of a total track length to a diagonal length of an effective image area of the image sensor of 0.63, and a F number of 1.88. As shown in Table 13, the imaging lens in Example 2 satisfies the conditional expressions (1) to (22).

FIG. 4 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 2. As shown in FIG. 4, each aberration is corrected excellently.

Example 3

The basic lens data is shown below in Table 3.

TABLE3 Example 3 Unit mm f = 6.68 Fno = 1.88 ω(°) = 42.0 h = 6.13 TTL = 7.86 Surface Data i r d Nd νd (Object) Infinity Infinity  1* 2.8436 0.6266 1.535 55.69 (νd1)  2* 4.9800 0.1633  3 (Stop) Infinity 0.0095  4* 4.9798 0.6368 1.535 55.69 (νd2)  5* −53.7742 0.0300  6* 18.7980 0.2822 1.661 20.37 (νd3)  7* 5.2767 0.5531  8* −842.3562 0.4054 1.535 55.69 (νd4)  9* −18.0036 0.5514 10* −9.3516 0.4005 1.661 20.37 (νd5) 11* 17.8525 0.1891 12* 3.0402 1.0986 1.614 25.59 (νd6) 13* 8.9473 0.9476 14* 5.5194 0.7724 1.535 55.69 (νd7) 15* 2.2588 0.5000 16 Infinity 0.1100 1.517 64.20 17 Infinity 0.6232 nage Plane Constituent Lens Data Lens Start Surface Focal Length TTL to diagonal length of effective image area 1 1 11.245 0.64 2 4 8.554 3 6 −11.195 4 8 34.393 5 10 −9.234 6 12 7.001 7 14 −7.793 Aspheric Surface Data 1st Surface 2nd Surface 4th Surface 5th Surface 6th Surface 7th Surface 8th Surface k −2.181981E+00 −4.624372E+01 −8.235904E+01   0.000000E+00   0.000000E+00 −1.813266E+00   0.000000E+00 A4   5.311016E−03   2.646188E−02   6.686677E−02   1.633807E−02   9.936288E−03 −1.389194E−03 −1.667064E−02 A6 −5.684157E−03 −4.673480E−02 −9.858077E−02 −4.203968E−02 −3.789077E−02   6.084297E−04 −7.125031E−03 A8   6.085378E−03   4.011640E−02   1.043445E−01   4.940367E−02   5.358050E−02   8.013560E−04   1.092140E−02 A10 −8.087301E−03 −3.278608E−02 −8.517896E−02 −4.661219E−02 −5.438805E−02   1.738730E−03 −2.076330E−02 A12   5.866957E−03   2.089519E−02   5.119184E−02   3.553094E−02   4.181989E−02 −2.044573E−03   2.168110E−02 A14 −2.699864E−03 −8.792286E−03 −2.033780E−02 −1.897672E−02 −2.240303E−02   9.811067E−04 −1.326986E−02 A16   7.590327E−04   2.274114E−03   4.972943E−03   6.270028E−03   7.590094E−03 −1.576921E−04   4.815789E−03 A18 −1.160453E−04 −3.276638E−04 −6.761362E−04 −1.130497E−03 −1.429570E−03 −6.539776E−06 −9.367590E−04 A20   7.336800E−06   2.009402E−05   3.895688E−05   8.461257E−05   1.131321E−04   2.970899E−06   7.429958E−05 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface 14th Surface 15th Surface k   0.000000E+00   8.302593E+00   0.000000E+00 −4.441908E+00   3.948781E+00 −4.332387E+00 −6.354717E+00 A4 −1.421686E−02 −1.794939E−02 −8.585888E−02 −4.970573E−02   5.009582E−03 −7.032196E−02 −3.152918E−02 A6   4.682657E−04   1.874446E−02   5.267857E−02   2.532889E−02 −4.421336E−03   2.058955E−02   7.674707E−03 A8 −3.559125E−03 −1.061819E−02 −2.633897E−02 −1.300547E−02   4.140924E−04 −4.864503E−03 −1.385477E−03 A10 −7.377955E−04   3.008168E−03   9.609629E−03   4.513820E−03   5.466768E−05   7.741967E−04   1.560337E−04 A12   2.850175E−03 −7.753328E−04 −2.673123E−03 −1.108946E−03 −2.070344E−05 −7.770484E−05 −1.121143E−05 A14 −1.925220E−03   2.926197E−04   5.529874E−04   1.894948E−04   2.771808E−06   4.890177E−06   5.261994E−07 A16   6.819815E−04 −7.609271E−05 −7.525029E−05 −2.123826E−05 −2.019787E−07 −1.880791E−07 −1.581094E−08 A18 −1.216929E−04   9.663806E−06   5.742000E−06   1.386247E−06   7.930975E−09   4.053409E−09   2.774647E−10 A20   8.312716E−06 −4.714483E−07 −1.830883E−07 −3.929159E−08 −1.312313E−10 −3.760190E−11 −2.162483E−12

The imaging lens in Example 3 achieves a ratio of a total track length to a diagonal length of an effective image area of the image sensor of 0.64, and a F number of 1.88. As shown in Table 13, the imaging lens in Example 3 satisfies the conditional expressions (1) to (22).

FIG. 6 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 3. As shown in FIG. 6, each aberration is corrected excellently.

Example 4

The basic lens data is shown below in Table 4.

TABLE4 Example 4 Unit mm f = 6.67 Fno = 1.88 ω(°) = 42.0 h = 6.13 TTL = 7.86 Surface Data i r d Nd νd (Object) Infinity Infinity  1* 2.8459 0.6236 1.535 55.69 (νd1)  2* 4.9834 0.1640  3 (Stop) Infinity 0.0060  4* 4.9844 0.6349 1.535 55.69 (νd2)  5* −54.0131 0.0300  6* 18.9795 0.2904 1.661 20.37 (νd3)  7* 5.3012 0.5517  8* −350.3639 0.4067 1.535 55.69 (νd4)  9* −17.2973 0.5440 10* −9.4133 0.4045 1.661 20.37 (νd5) 11* 17.8083 0.1939 12* 3.0377 1.0919 1.614 25.59 (νd6) 13* 8.9586 0.9211 14* 5.5280 0.7798 1.535 55.69 (νd7) 15* 2.2655 0.5000 16 Infinity 0.1100 1.517 64.20 17 Infinity 0.6426 nage Plane Constituent Lens Data Lens Start Surface Focal Length TTL to diagonal length of effective image area 1 1 11.261 0.64 2 4 8.565 3 6 −11.227 4 8 34.008 5 10 −9.265 6 12 6.992 7 14 −7.830 Aspheric Surface Data 1st Surface 2nd Surface 4th Surface 5th Surface 6th Surface 7th Surface 8th Surface k −2.183992E+00 −4.620531E+01 −8.243880E+01   0.000000E+00   0.000000E+00 −1.833870E+00   0.000000E+00 A4   5.303409E−03   2.645642E−02   6.687267E−02   1.636442E−02   9.933659E−03 −1.404835E−03 −1.666588E−02 A6 −5.684648E−03 −4.673712E−02 −9.859679E−02 −4.202854E−02 −3.789334E−02   6.053930E−04 −7.097783E−03 A8   6.085646E−03   4.011602E−02   1.043414E−01   4.940720E−02   5.358065E−02   8.006688E−04   1.093482E−02 A10 −8.087221E−03 −3.278603E−02 −8.518010E−02 −4.661136E−02 −5.438734E−02   1.737492E−03 −2.075890E−02 A12   5.866987E−03   2.089506E−02   5.119147E−02   3.553108E−02   4.182036E−02 −2.045470E−03   2.168227E−02 A14 −2.699885E−03 −8.792323E−03 −2.033792E−02 −1.897679E−02 −2.240283E−02   9.806823E−04 −1.326963E−02 A16   7.590260E−04   2.274093E−03   4.972904E−03   6.270001E−03   7.590150E−03 −1.577552E−04   4.815814E−03 A18 −1.160529E−04 −3.276773E−04 −6.761482E−04 −1.130500E−03 −1.429565E−03 −6.515208E−06 −9.367700E−04 A20   7.335261E−06   2.009018E−05   3.895301E−05   8.461457E−05   1.131254E−04   2.979839E−06   7.428826E−05 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface 14th Surface 15th Surface k   0.000000E+00   8.299506E+00   0.000000E+00 −4.395762E+00   3.934477E+00 −4.344748E+00 −6.368205E+00 A4 −1.418762E−02 −1.792120E−02 −8.585353E−02 −4.979382E−02   4.996334E−03 −7.032397E−02 −3.156499E−02 A6   4.882106E−04   1.873803E−02   5.268642E−02   2.532212E−02 −4.423020E−03   2.058949E−02   7.674427E−03 A8 −3.555174E−03 −1.061897E−02 −2.633837E−02 −1.300536E−02   4.140204E−04 −4.864505E−03 −1.385483E−03 A10 −7.375904E−04   3.008104E−03   9.609649E−03   4.513846E−03   5.466490E−05   7.741966E−04   1.560335E−04 A12   2.850314E−03 −7.753468E−04 −2.673123E−03 −1.108947E−03 −2.070347E−05 −7.770486E−05 −1.121144E−05 A14 −1.925184E−03   2.926145E−04   5.529874E−04   1.894944E−04   2.771803E−06   4.890175E−06   5.261991E−07 A16   6.819908E−04 −7.609424E−05 −7.525028E−05 −2.123832E−05 −2.019793E−07 −1.880792E−07 −1.581094E−08 A18 −1.216918E−04   9.663456E−06   5.741995E−06   1.386239E−06   7.930913E−09   4.053402E−09   2.774647E−10 A20   8.312138E−06 −4.715106E−07 −1.830912E−07 −3.929167E−08 −1.312363E−10 −3.760238E−11 −2.162471E−12

The imaging lens in Example 4 achieves a ratio of a total track length to a diagonal length of an effective image area of the image sensor of 0.64, and a F number of 1.88. As shown in Table 13, the imaging lens in Example 4 satisfies the conditional expressions (1) to (22).

FIG. 8 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 4. As shown in FIG. 8, each aberration is corrected excellently.

Example 5

The basic lens data is shown below in Table 5.

TABLE5 Example 5 Unit mm f = 6.66 Fno = 1.88 ω(°) = 42.1 h = 6.13 TTL = 7.84 Surface Data i r d Nd νd (Object) Infinity Infinity  1* 2.8491 0.6264 1.535 55.69 (νd1)  2* 4.9699 0.1774  3 (Stop) Infinity −0.0065  4* 5.0059 0.6344 1.535 55.69 (νd2)  5* −51.6314 0.0300  6* 18.5617 0.3003 1.661 20.37 (νd3)  7* 5.3369 0.5378  8* −335.7082 0.4118 1.535 55.69 (νd4)  9* −17.0035 0.5463 10* −9.4226 0.3964 1.661 20.37 (νd5) 11* 17.3629 0.1934 12* 3.0369 1.0799 1.614 25.59 (νd6) 13* 8.9490 0.8812 14* 5.7421 0.7928 1.535 55.69 (νd7) 15* 2.3139 0.5000 16 Infinity 0.1100 1.517 64.20 17 Infinity 0.6659 nage Plane Constituent Lens Data Lens Start Surface Focal Length TTL to diagonal length of effective image area 1 1 11.319 0.64 2 4 8.566 3 6 −11.440 4 8 33.475 5 10 −9.190 6 12 6.998 7 14 −7.882 Aspheric Surface Data 1st Surface 2nd Surface 4th Surface 5th Surface 6th Surface 7th Surface 8th Surface k −2.199586E+00 −4.493087E+01 −8.197176E+01   0.000000E+00   0.000000E+00 −1.512150E+00   0.000000E+00 A4   5.245167E−03   2.631316E−02   6.673081E−02   1.624328E−02   1.029185E−02 −1.145337E−03 −1.640590E−02 A6 −5.741877E−03 −4.680947E−02 −9.864369E−02 −4.200194E−02 −3.784478E−02   5.293003E−04 −6.796707E−03 A8   6.083930E−03   4.010724E−02   1.043299E−01   4.942477E−02   5.356459E−02   8.317881E−04   1.100833E−02 A10 −8.085740E−03 −3.278561E−02 −8.518309E−02 −4.660586E−02 −5.439315E−02   1.748757E−03 −2.073553E−02 A12   5.866349E−03   2.089548E−02   5.119225E−02   3.553251E−02   4.181749E−02 −2.047699E−03   2.168524E−02 A14 −2.700030E−03 −8.792292E−03 −2.033712E−02 −1.897738E−02 −2.240405E−02   9.781831E−04 −1.326910E−02 A16   7.590264E−04   2.274092E−03   4.973317E−03   6.269674E−03   7.589706E−03 −1.584180E−04   4.815605E−03 A18 −1.160550E−04 −3.277325E−04 −6.761049E−04 −1.130550E−03 −1.429803E−03 −6.601704E−06 −9.369109E−04 A20   7.338916E−06   2.010322E−05   3.888633E−05   8.460650E−05   1.132318E−04   2.992569E−06   7.420816E−05 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface 14th Surface 15th Surface k   0.000000E+00   8.265831E+00   0.000000E+00 −4.336249E+00   3.812861E+00 −4.962131E+00 −6.431913E+00 A4 −1.383998E−02 −1.782418E−02 −8.604971E−02 −4.994589E−02   5.142495E−03 −7.042273E−02 −3.205305E−02 A6   5.643065E−04   1.865238E−02   5.272496E−02   2.529436E−02 −4.455373E−03   2.058693E−02   7.687149E−03 A8 −3.536202E−03 −1.062538E−02 −2.634096E−02 −1.300656E−02   4.132758E−04 −4.864573E−03 −1.385200E−03 A10 −7.292038E−04   3.006705E−03   9.609442E−03   4.513660E−03   5.467905E−05   7.741982E−04   1.560256E−04 A12   2.853197E−03 −7.751497E−04 −2.673062E−03 −1.108976E−03 −2.070128E−05 −7.770472E−05 −1.121192E−05 A14 −1.925335E−03   2.927281E−04   5.530074E−04   1.894923E−04   2.771870E−06   4.890172E−06   5.261856E−07 A16   6.816645E−04 −7.608193E−05 −7.524689E−05 −2.123831E−05 −2.019846E−07 −1.880802E−07 −1.581120E−08 A18 −1.217585E−04   9.665603E−06   5.742353E−06   1.386309E−06   7.930392E−09   4.053267E−09   2.774619E−10 A20   8.327172E−06 −4.721965E−07 −1.831149E−07 −3.925992E−08 −1.313154E−10 −3.761003E−11 −2.162560E−12

The imaging lens in Example 5 achieves a ratio of a total track length to a diagonal length of an effective image area of the image sensor of 0.64, and a F number of 1.88. As shown in Table 13, the imaging lens in Example 5 satisfies the conditional expressions (1) to (22).

FIG. 10 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 5. As shown in FIG. 10, each aberration is corrected excellently.

Example 6

The basic lens data is shown below in Table 6.

TABLE 6 Example 6 Unit mm f = 6.67 Fno = 1.88 ω(°) = 42.2 h = 6.13 TTL = 7.87 Surface Data i r d Nd νd (Object) Infinity Infinity  1* 2.8642 0.6220 1.535 55.69 (νd1)  2* 4.9569 0.1575  3 (Stop) Infinity 0.0152  4* 5.0407 0.6300 1.535 55.69 (νd2)  5* −50.4417 0.0300  6* 17.4977 0.3000 1.661 20.37 (νd3)  7* 5.3296 0.5399  8* −122.2070 0.4193 1.535 55.69 (νd4)  9* −16.3541 0.5351 10* −9.0682 0.4049 1.661 20.37 (νd5) 11* 20.4917 0.1892 12* 3.0681 1.0549 1.614 25.59 (νd6) 13* 8.6239 0.7171 14* 4.7963 0.8275 1.535 55.69 (νd7) 15* 2.2757 0.5000 16 Infinity 0.1100 1.517 64.20 17 Infinity 0.8586 nage Plane Constituent Lens Data Lens Start Surface Focal Length TTL to diagonal length of effective image area 1 1 11.495 0.64 2 4 8.603 3 6 −11.714 4 8 35.255 5 10 −9.462 6 12 7.231 7 14 −9.143 Aspheric Surface Data 1st Surface 2nd Surface 4th Surface 5th Surface 6th Surface 7th Surface 8th Surface k −2.239301E+00 −4.413349E+01 −8.285783E+01   0.000000E+00   0.000000E+00 −2.139953E+00   0.000000E+00 A4   5.001384E−03   2.619054E−02   6.658274E−02   1.619229E−02   1.025591E−02 −7.220425E−04 −1.622422E−02 A6 −5.735291E−03 −4.685425E−02 −9.862260E−02 −4.198390E−02 −3.786470E−02   5.403466E−04 −6.810502E−03 A8   6.076302E−03   4.012432E−02   1.043293E−01   4.945194E−02   5.356294E−02   7.652225E−04   1.105591E−02 A10 −8.085853E−03 −3.277799E−02 −8.518533E−02 −4.658936E−02 −5.440669E−02   1.724689E−03 −2.072664E−02 A12   5.867824E−03   2.089369E−02   5.119217E−02   3.552481E−02   4.181126E−02 −2.051399E−03   2.167889E−02 A14 −2.699690E−03 −8.792721E−03 −2.033668E−02 −1.897892E−02 −2.240571E−02   9.780406E−04 −1.327505E−02 A16   7.590323E−04   2.273962E−03   4.973430E−03   6.269114E−03   7.589686E−03 −1.590413E−04   4.813962E−03 A18 −1.160970E−04 −3.276961E−04 −6.761359E−04 −1.130888E−03 −1.429466E−03 −6.785843E−06 −9.368723E−04 A20   7.339351E−06   2.010190E−05   3.878471E−05   8.468839E−05   1.132318E−04   3.235464E−06   7.445499E−05 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface 14th Surface 15th Surface k   0.000000E+00   7.306567E+00   0.000000E+00 −3.965167E+00   3.711253E+00 −5.129381E+00 −5.972971E+00 A4 −1.374153E−02 −1.707288E−02 −8.615693E−02 −5.066554E−02   5.441687E−03 −7.037105E−02 −3.285238E−02 A6   4.908028E−04   1.863097E−02   5.291339E−02   2.532976E−02 −4.500987E−03   2.059645E−02   7.730932E−03 A8 −3.536142E−03 −1.064580E−02 −2.632870E−02 −1.299126E−02   4.129237E−04 −4.863987E−03 −1.384907E−03 A10 −7.387937E−04   3.006603E−03   9.609119E−03   4.514278E−03   5.470898E−05   7.742147E−04   1.560089E−04 A12   2.849025E−03 −7.749457E−04 −2.673211E−03 −1.109119E−03 −2.069988E−05 −7.770568E−05 −1.121279E−05 A14 −1.926448E−03   2.927627E−04   5.529481E−04   1.894617E−04   2.771694E−06   4.890061E−06   5.261582E−07 A16   6.813713E−04 −7.605686E−05 −7.525085E−05 −2.124096E−05 −2.019998E−07 −1.880855E−07 −1.581154E−08 A18 −1.216418E−04   9.659436E−06   5.742285E−06   1.386362E−06   7.929836E−09   4.053273E−09   2.774942E−10 A20   8.354994E−06 −4.728054E−07 −1.829090E−07 −3.924191E−08 −1.312193E−10 −3.757735E−11 −2.158794E−12

The imaging lens in Example 6 achieves a ratio of a total track length to a diagonal length of an effective image area of the image sensor of 0.64, and a F number of 1.88. As shown in Table 13, the imaging lens in Example 6 satisfies the conditional expressions (1) to (22).

FIG. 12 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 6. As shown in FIG. 12, each aberration is corrected excellently.

Example 7

The basic lens data is shown below in Table 7.

TABLE 7 Example 7 Unit mm f = 6.66 Fno = 1.88 ω(°) = 42.2 h = 6.13 TTL = 7.90 Surface Data i r d Nd νd (Object) Infinity Infinity  1* 2.8949 0.6124 1.535 55.69 (νd1)  2* 4.8993 0.1269  3 (Stop) Infinity 0.0636  4* 4.9255 0.6377 1.535 55.69 (νd2)  5* −39.0374 0.0300  6* 16.8190 0.3000 1.661 20.37 (νd3)  7* 5.1760 0.5431  8* 108.0257 0.4164 1.535 55.69 (νd4)  9* −22.0719 0.5451 10* −7.1813 0.4185 1.661 20.37 (νd5) 11* 32.6862 0.1598 12* 3.0761 1.0880 1.614 25.59 (νd6) 13* 8.4739 0.6267 14* 3.6857 0.8058 1.535 55.69 (νd7) 15* 2.0578 0.5000 16 Infinity 0.1100 1.517 64.20 17 Infinity 0.9548 nage Plane Constituent Lens Data Lens Start Surface Focal Length TTL to diagonal length of effective image area 1 1 11.957 0.64 2 4 8.220 3 6 −11.433 4 8 34.307 5 10 −8.874 6 12 7.302 7 14 −10.528 Aspheric Surface Data 1st Surface 2nd Surface 4th Surface 5th Surface 6th Surface 7th Surface 8th Surface k −2.347260E+00 −4.398985E+01 −7.796427E+01   0.000000E+00   0.000000E+00 −2.417374E+00   0.000000E+00 A4   4.444418E−03   2.560158E−02   6.600069E−02   1.579992E−02   1.048679E−02 −8.249169E−04 −1.577602E−02 A6 −5.982046E−03 −4.700216E−02 −9.871423E−02 −4.208921E−02 −3.781302E−02   4.482846E−04 −6.562991E−03 A8   6.058122E−03   4.010051E−02   1.043083E−01   4.942276E−02   5.354472E−02   7.415090E−04   1.113895E−02 A10 −8.078666E−03 −3.277616E−02 −8.519527E−02 −4.658840E−02 −5.443023E−02   1.723197E−03 −2.071490E−02 A12   5.870959E−03   2.089694E−02   5.118732E−02   3.552686E−02   4.180164E−02 −2.053331E−03   2.166603E−02 A14 −2.698971E−03 −8.793101E−03 −2.033725E−02 −1.897986E−02 −2.240647E−02   9.768310E−04 −1.327918E−02 A16   7.590894E−04   2.274147E−03   4.973456E−03   6.268026E−03   7.591435E−03 −1.624270E−04   4.809152E−03 A18 −1.161684E−04 −3.277791E−04 −6.760962E−04 −1.131274E−03 −1.428600E−03 −6.626032E−06 −9.368994E−04 A20   7.334119E−06   2.010426E−05   3.871443E−05   8.484905E−05   1.130279E−04   3.709809E−06   7.481025E−05 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface 14th Surface 15th Surface k   0.000000E+00   5.124237E+00   0.000000E+00 −4.609278E+00   3.603990E+00 −6.628468E+00 −5.371440E+00 A4 −1.324454E−02 −1.456730E−02 −8.763366E−02 −4.913096E−02   5.697105E−03 −7.035171E−02 −3.438487E−02 A6   7.539471E−04   1.832459E−02   5.355438E−02   2.529297E−02 −4.496272E−03   2.059902E−02   7.830698E−03 A8 −3.544776E−03 −1.065816E−02 −2.636434E−02 −1.298567E−02   4.114819E−04 −4.863038E−03 −1.384156E−03 A10 −7.401439E−04   3.017310E−03   9.600648E−03   4.515585E−03   5.461433E−05   7.742467E−04   1.559512E−04 A12   2.843907E−03 −7.752833E−04 −2.673481E−03 −1.109081E−03 −2.070136E−05 −7.770699E−05 −1.121613E−05 A14 −1.927935E−03   2.926843E−04   5.530250E−04   1.894600E−04   2.771786E−06   4.889883E−06   5.261239E−07 A16   6.805502E−04 −7.601869E−05 −7.523915E−05 −2.124630E−05 −2.019953E−07 −1.880928E−07 −1.580842E−08 A18 −1.216312E−04   9.666478E−06   5.743029E−06   1.386057E−06   7.931983E−09   4.053395E−09   2.776464E−10 A20   8.353475E−06 −4.760567E−07 −1.830642E−07 −3.919165E−08 −1.313233E−10 −3.754828E−11 −2.162087E−12

The imaging lens in Example 7 achieves a ratio of a total track length to a diagonal length of an effective image area of the image sensor of 0.64, and a F number of 1.88. As shown in Table 13, the imaging lens in Example 7 satisfies the conditional expressions (1) to (22).

FIG. 14 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 7. As shown in FIG. 14, each aberration is corrected excellently.

Example 8

The basic lens data is shown below in Table 8.

TABLE 8 Example 8 Unit mm f = 6.64 Fno = 1.88 ω(°) = 42.2 h = 6.13 TTL = 7.89 Surface Data i r d Nd νd (Object) Infinity Infinity  1* 3.0934 0.6684 1.535 55.69 (νd1)  2* 5.4306 0.1090  3 (Stop) Infinity 0.0459  4* 4.7294 0.6630 1.535 55.69 (νd2)  5* −80.6035 0.0300  6* 11.2909 0.3000 1.671 19.24 (νd3)  7* 4.7793 0.6015  8* −75.0809 0.4671 1.535 55.69 (νd4)  9* −12.2393 0.4309 10* −5.4677 0.3635 1.661 20.37 (νd5) 11* 225.1423 0.2181 12* 3.1306 1.1847 1.614 25.59 (νd6) 13* 12.1929 0.6939 14* 4.1098 0.6818 1.535 55.69 (νd7) 15* 1.9754 0.3500 16 Infinity 0.1100 1.517 64.20 17 Infinity 1.0133 nage Plane Constituent Lens Data Lens Start Surface Focal Length TTL to diagonal length of effective image area 1 1 12.221 0.64 2 4 8.376 3 6 −12.588 4 8 27.272 5 10 −8.074 6 12 6.533 7 14 −8.003 Aspheric Surface Data 1st Surface 2nd Surface 4th Surface 5th Surface 6th Surface 7th Surface 8th Surface k   0.000000E+00 −6.162080E+01 −6.926947E+01   0.000000E+00   0.000000E+00   0.000000E+00   0.000000E+00 A4 −1.082770E−02   2.340885E−02   6.603016E−02   2.794685E−02   2.815830E−02   3.774083E−03 −1.621979E−02 A6   3.070605E−03 −6.247675E−02 −1.162014E−01 −1.081046E−01 −1.055276E−01 −6.566340E−03 −5.414382E−03 A8 −1.121974E−02   6.485140E−02   1.391254E−01   1.719072E−01   1.797839E−01   4.656692E−03   1.202284E−02 A10   1.106686E−02 −5.437208E−02 −1.241581E−01 −1.717793E−01 −1.915673E−01   5.258504E−03 −2.496607E−02 A12 −6.981225E−03   3.467745E−02   8.158746E−02   1.141985E−01   1.346785E−01 −1.090587E−02   2.453155E−02 A14   2.695582E−03 −1.504401E−02 −3.630027E−02 −5.081013E−02 −6.294062E−02   8.109540E−03 −1.340572E−02 A16 −6.146762E−04   4.096647E−03   1.017232E−02   1.454240E−02   1.887133E−02 −3.063536E−03   4.167778E−03 A18   7.690659E−05 −6.273410E−04 −1.613626E−03 −2.410505E−03 −3.271488E−03   5.960457E−04 −6.659474E−04 A20 −4.103783E−06   4.109873E−05   1.104098E−04   1.752281E−04   2.480299E−04 −4.781183E−05   4.012911E−05 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface 14th Surface 15th Surface k   0.000000E+00   0.000000E+00   0.000000E+00 −3.573939E+00   0.000000E+00 −1.361193E+01 −5.660713E+00 A4 −1.340373E−02 −3.271961E−02 −1.024544E−01 −5.234776E−02   1.248660E−02 −7.405039E−02 −4.197433E−02 A6 −2.186490E−03   3.239620E−02   6.617210E−02   2.537035E−02 −5.297555E−03   2.422202E−02   1.148835E−02 A8   8.215593E−03 −1.119866E−02 −3.182551E−02 −1.235560E−02 −6.122285E−05 −6.549017E−03 −2.442776E−03 A10 −1.630493E−02 −3.929428E−03   1.008937E−02   3.729984E−03   2.727951E−04   1.155692E−03   3.249712E−04 A12   1.334947E−02   4.781271E−03 −2.058331E−03 −7.310693E−04 −6.483284E−05 −1.251243E−04 −2.636476E−05 A14 −6.006606E−03 −1.705902E−03   2.969943E−04   9.479559E−05   7.876321E−06   8.355218E−06   1.309921E−06 A16   1.600628E−03   3.040702E−04 −3.204798E−05 −8.166239E−06 −5.409562E−07 −3.375191E−07 −3.894094E−08 A18 −2.339968E−04 −2.772098E−05   2.281527E−06   4.464557E−07   1.984811E−08   7.588372E−09   6.356537E−10 A20   1.422674E−05   1.034065E−06 −7.434296E−08 −1.186012E−08 −3.022898E−10 −7.306323E−11 −4.373648E−12

The imaging lens in Example 8 achieves a ratio of a total track length to a diagonal length of an effective image area of the image sensor of 0.64, and a F number of 1.88. As shown in Table 13, the imaging lens in Example 8 satisfies the conditional expressions (1) to (22).

FIG. 16 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 8. As shown in FIG. 16, each aberration is corrected excellently.

Example 9

The basic lens data is shown below in Table 9.

TABLE 9 Example 9 Unit mm f = 6.64 Fno = 1.88 ω(°) = 42.2 h = 6.13 TTL = 7.89 Surface Data i r d Nd νd (Object) Infinity Infinity  1* 3.0929 0.6673 1.535 55.69 (νd1)  2* 5.4291 0.1084  3 (Stop) Infinity 0.0458  4* 4.7272 0.6621 1.535 55.69 (νd2)  5* −80.5275 0.0300  6* 11.2442 0.3000 1.671 19.24 (νd3)  7* 4.7684 0.6022  8* −76.2161 0.4652 1.535 55.69 (νd4)  9* −12.2650 0.4303 10* −5.4785 0.3666 1.661 20.37 (νd5) 11* 216.2442 0.2179 12* 3.1275 1.1835 1.614 25.59 (νd6) 13* 12.1423 0.6942 14* 4.1595 0.6849 1.535 55.69 (νd7) 15* 1.9863 0.3500 16 Infinity 0.1100 1.517 64.20 17 Infinity 1.0110 nage Plane Constituent Lens Data Lens Start Surface Focal Length TTL to diagonal length of effective image area 1 1 12.223 0.64 2 4 8.372 3 6 −12.578 4 8 27.262 5 10 −8.081 6 12 6.532 7 14 −7.985 Aspheric Surface Data 1st Surface 2nd Surface 4th Surface 5th Surface 6th Surface 7th Surface 8th Surface k   0.000000E+00 −6.171025E+01 −6.925505E+01   0.000000E+00   0.000000E+00   0.000000E+00   0.000000E+00 A4 −1.082919E−02   2.341295E−02   6.602403E−02   2.795240E−02   2.816202E−02   3.779441E−03 −1.618206E−02 A6   3.068096E−03 −6.247477E−02 −1.162036E−01 −1.081031E−01 −1.055257E−01 −6.571619E−03 −5.415252E−03 A8 −1.122065E−02   6.485188E−02   1.391246E−01   1.719080E−01   1.797845E−01   4.653685E−03   1.201932E−02 A10   1.106684E−02 −5.437210E−02 −1.241583E−01 −1.717790E−01 −1.915673E−01   5.256966E−03 −2.496813E−02 A12 −6.981223E−03   3.467742E−02   8.158750E−02   1.141987E−01   1.346784E−01 −1.090650E−02   2.453137E−02 A14   2.695570E−03 −1.504403E−02 −3.630022E−02 −5.081008E−02 −6.294067E−02   8.109330E−03 −1.340563E−02 A16 −6.146751E−04   4.096644E−03   1.017234E−02   1.454240E−02   1.887132E−02 −3.063580E−03   4.167818E−03 A18   7.690760E−05 −6.273393E−04 −1.613619E−03 −2.410497E−03 −3.271493E−03   5.960541E−04 −6.659060E−04 A20 −4.103457E−06   4.109965E−05   1.104115E−04   1.752302E−04   2.480304E−04 −4.779545E−05   4.012978E−05 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface 14th Surface 15th Surface k   0.000000E+00   0.000000E+00   0.000000E+00 −3.579830E+00   0.000000E+00 −1.350578E+01 −5.654837E+00 A4 −1.341715E−02 −3.271557E−02 −1.024616E−01 −5.234976E−02   1.246778E−02 −7.405040E−02 −4.196997E−02 A6 −2.184327E−03   3.239696E−02   6.617047E−02   2.537074E−02 −5.298028E−03   2.422207E−02   1.148851E−02 A8   8.216320E−03 −1.119915E−02 −3.182575E−02 −1.235560E−02 −6.122769E−05 −6.549019E−03 −2.442770E−03 A10 −1.630472E−02 −3.929495E−03   1.008934E−02   3.729984E−03   2.727950E−04   1.155692E−03   3.249714E−04 A12   1.334949E−02   4.781261E−03 −2.058336E−03 −7.310702E−04 −6.483288E−05 −1.251243E−04 −2.636475E−05 A14 −6.006587E−03 −1.705905E−03   2.969942E−04   9.479553E−05   7.876317E−06   8.355218E−06   1.309922E−06 A16   1.600637E−03   3.040698E−04 −3.204797E−05 −8.166223E−06 −5.409564E−07 −3.375191E−07 −3.894094E−08 A18 −2.339929E−04 −2.772103E−05   2.281527E−06   4.464563E−07   1.984812E−08   7.588373E−09   6.356537E−10 A20   1.422813E−05   1.034052E−06 −7.434213E−08 −1.186000E−08 −3.022890E−10 −7.306318E−11 −4.373646E−12

The imaging lens in Example 9 achieves a ratio of a total track length to a diagonal length of an effective image area of the image sensor of 0.64, and a F number of 1.88. As shown in Table 13, the imaging lens in Example 9 satisfies the conditional expressions (1) to (22).

FIG. 18 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 9. As shown in FIG. 18, each aberration is corrected excellently.

Example 10

The basic lens data is shown below in Table 10.

TABLE 10 Example 10 Unit mm f = 6.62 Fno = 1.88 ω(°) = 42.2 h = 6.13 TTL = 7.89 Surface Data i r d Nd νd (Object) Infinity Infinity  1* 3.1249 0.6640 1.535 55.69 (νd1)  2* 5.3833 0.1023  3 (Stop) Infinity 0.0500  4* 4.7077 0.6726 1.535 55.69 (νd2)  5* −60.2803 0.0300  6* 10.1390 0.3000 1.671 19.24 (νd3)  7* 4.5348 0.5925  8* −88.5736 0.4645 1.535 55.69 (νd4)  9* −12.2903 0.4274 10* −5.6898 0.3778 1.661 20.37 (νd5) 11* 113.6120 0.2234 12* 3.1208 1.1667 1.614 25.59 (νd6) 13* 11.3640 0.6885 14* 4.1915 0.6975 1.535 55.69 (νd7) 15* 2.0090 0.3500 16 Infinity 0.1100 1.517 64.20 17 Infinity 1.0131 nage Plane Constituent Lens Data Lens Start Surface Focal Length TTL to diagonal length of effective image area 1 1 12.633 0.64 2 4 8.194 3 6 −12.500 4 8 26.627 5 10 −8.190 6 12 6.646 7 14 −8.118 Aspheric Surface Data 1st Surface 2nd Surface 4th Surface 5th Surface 6th Surface 7th Surface 8th Surface k   0.000000E+00 −6.036244E+01 −6.894481E+01   0.000000E+00   0.000000E+00   0.000000E+00   0.000000E+00 A4 −1.082071E−02   2.378474E−02   6.586485E−02   2.801180E−02   2.834211E−02   3.609755E−03 −1.527287E−02 A6   3.144523E−03 −6.232960E−02 −1.162206E−01 −1.080823E−01 −1.054701E−01 −6.661776E−03 −5.291754E−03 A8 −1.119138E−02   6.488780E−02   1.391337E−01   1.719383E−01   1.797682E−01   4.615463E−03   1.204649E−02 A10   1.107575E−02 −5.436419E−02 −1.241519E−01 −1.717653E−01 −1.915852E−01   5.247689E−03 −2.494690E−02 A12 −6.979720E−03   3.467904E−02   8.159006E−02   1.142019E−01   1.346719E−01 −1.091052E−02   2.453750E−02 A14   2.695629E−03 −1.504384E−02 −3.629934E−02 −5.081039E−02 −6.294192E−02   8.108082E−03 −1.340476E−02 A16 −6.147317E−04   4.096524E−03   1.017258E−02   1.454203E−02   1.887186E−02 −3.063737E−03   4.167315E−03 A18   7.687945E−0S −6.273893E−04 −1.613615E−03 −2.410656E−03 −3.271200E−03   5.961504E−04 −6.662477E−04 A20 −4.107063E−06   4.109580E−05   1.103730E−04   1.753030E−04   2.479686E−04 −4.781254E−05   4.012856E−05 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface 14th Surface 15th Surface k   0.000000E+00   0.000000E+00   0.000000E+00 −3.271446E+00   0.000000E+00 −1.300850E+01 −5.655138E+00 A4 −1.303338E−02 −3.311130E−02 −1.023200E−01 −5.291740E−02   1.201981E−02 −7.399047E−02 −4.187043E−02 A6 −2.143542E−03   3.237723E−02   6.615663E−02   2.532653E−02 −5.286626E−03   2.422336E−02   1.147932E−02 A8   8.213148E−03 −1.119894E−02 −3.183040E−02 −1.235166E−02 −6.033062E−05 −6.548989E−03 −2.442684E−03 A10 −1.630413E−02 −3.929741E−03   1.008870E−02   3.730807E−03   2.728277E−04   1.155691E−03   3.249773E−04 A12   1.335073E−02   4.781251E−03 −2.058336E−03 −7.310289E−04 −6.483331E−05 −1.251244E−04 −2.636443E−05 A14 −6.005947E−03 −1.705920E−03   2.970042E−04   9.479432E−05   7.876139E−06   8.355207E−06   1.309925E−06 A16   1.600789E−03   3.040732E−04 −3.204654E−05 −8.166711E−06 −5.409702E−07 −3.375193E−07 −3.894102E−08 A18 −2.339782E−04 −2.771999E−05   2.281657E−06   4.464264E−07   1.984791E−08   7.588388E−09   6.356469E−10 A20   1.419603E−05   1.033796E−06 −7.435890E−08 −1.185929E−08 −3.022155E−10 −7.306124E−11 −4.373700E−12

The imaging lens in Example 10 achieves a ratio of a total track length to a diagonal length of an effective image area of the image sensor of 0.64, and a F number of 1.88. As shown in Table 13, the imaging lens in Example 10 satisfies the conditional expressions (1) to (22).

FIG. 20 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 10. As shown in FIG. 20, each aberration is corrected excellently.

Example 11

The basic lens data is shown below in Table 11.

TABLE 11 Example 11 Unit mm f = 6.63 Fno = 1.88 ω(°) = 42.2 h = 6.13 TTL = 7.89 Surface Data i r d Nd νd (Object) Infinity Infinity  1* 3.0821 0.6692 1.535 55.69 (νd1)  2* 5.4330 0.0941  3 (Stop) Infinity 0.0651  4* 4.7102 0.6586 1.535 55.69 (νd2)  5* −75.0614 0.0300  6* 10.2161 0.3000 1.671 19.24 (νd3)  7* 4.5764 0.6021  8* −252.5397 0.4652 1.535 55.69 (νd4)  9* −13.3362 0.3773 10* −5.5369 0.4826 1.661 20.37 (νd5) 11* 99.2629 0.1928 12* 3.0985 1.0674 1.614 25.59 (νd6) 13* 11.8623 0.6889 14* 4.6518 0.7539 1.535 55.69 (νd7) 15* 2.0898 0.3500 16 Infinity 0.1100 1.517 64.20 17 Infinity 1.0231 nage Plane Constituent Lens Data Lens Start Surface Focal Length TTL to diagonal length of effective image area 1 1 12.117 0.64 2 4 8.311 3 6 −12.629 4 8 26.309 5 10 −7.922 6 12 6.526 7 14 −7.905 Aspheric Surface Data 1st Surface 2nd Surface 4th Surface 5th Surface 6th Surface 7th Surface 8th Surface k   0.000000E+00 −6.161903E+01 −6.836232E+01   0.000000E+00   0.000000E+00   0.000000E+00   0.000000E+00 A4 −1.123206E−02   2.346536E−02   6.666630E−02   2.896342E−02   2.947791E−02   5.761154E−03 −1.618043E−02 A6   3.793330E−03 −6.245115E−02 −1.186660E−01 −1.050190E−01 −1.049349E−01 −1.503962E−02 −1.089095E−03 A8 −1.206114E−02   6.486145E−02   1.449310E−01   1.560455E−01   1.721289E−01   2.714509E−02   5.901836E−03 A10   1.151869E−02 −5.436889E−02 −1.323517E−01 −1.455351E−01 −1.793686E−01 −3.195471E−02 −1.976810E−02 A12 −7.046395E−03   3.467812E−02   8.873097E−02   9.079401E−02   1.247735E−01   2.660644E−02   2.123081E−02 A14   2.652371E−03 −1.504400E−02 −4.015255E−02 −3.835201E−02 −5.813403E−02 −1.505250E−02 −1.192299E−02 A16 −5.911068E−04   4.096591E−03   1.142072E−02   1.059129E−02   1.747069E−02   5.521260E−03   3.730412E−03 A18   7.238349E−05 −6.273657E−04 −1.835716E−03 −1.722239E−03 −3.047264E−03 −1.159338E−03 −5.865360E−04 A20 −3.791284E−06   4.109582E−05   1.269794E−04   1.244713E−04   2.330075E−04   1.043869E−04   3.306160E−05 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface 14th Surface 15th Surface k   0.000000E+00   0.000000E+00   0.000000E+00 −3.578744E+00   0.000000E+00 −1.165523E+01 −5.900438E+00 A4 −1.534805E−02 −2.716087E−02 −9.502287E−02 −4.879961E−02   1.657095E−02 −7.406840E−02 −3.888531E−02 A6 −4.724120E−03   1.926968E−02   5.326433E−02   2.131953E−02 −8.353146E−03   2.306606E−02   1.012534E−02 A8   2.137516E−02   6.560363E−03 −2.057229E−02 −9.826630E−03   9.891477E−04 −5.948555E−03 −2.082491E−03 A10 −3.517960E−02 −1.881182E−02   4.086123E−03   2.631642E−03   3.365120E−05   1.033348E−03   2.769051E−04 A12   2.725062E−02   1.226671E−02 −1.913290E−05 −4.284309E−04 −2.746097E−05 −1.122193E−04 −2.309154E−05 A14 −1.207720E−02 −3.943989E−03 −1.407642E−04   4.456630E−05   4.085833E−06   7.597855E−06   1.206518E−06 A16   3.206855E−03   6.938996E−04   2.488820E−05 −3.267302E−06 −3.094242E−07 −3.134525E−07 −3.847970E−08 A18 −4.720611E−04 −6.432879E−05 −1.785742E−06   1.846640E−07   1.222739E−08   7.234908E−09   6.863960E−10 A20   2.925901E−05   2.469514E−06   4.758476E−08 −5.864362E−09 −1.995365E−10 −7.179068E−11 −5.252663E−12

The imaging lens in Example 11 achieves a ratio of a total track length to a diagonal length of an effective image area of the image sensor of 0.64, and a F number of 1.88. As shown in Table 13, the imaging lens in Example 11 satisfies the conditional expressions (1) to (22).

FIG. 22 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 11. As shown in FIG. 22, each aberration is corrected excellently.

Example 12

The basic lens data is shown below in Table 12.

TABLE 12 Example 12 Unit mm f = 6.52 Fno = 1.88 ω(°) = 42.6 h = 6.13 TTL = 7.67 Surface Data i r d Nd νd (Object) Infinity Infinity  1 (Stop) lnfinity −0.6750  2* 2.5037 0.9500 1.535 55.69 (νd1)  3* 9.4252 0.0750  4* 8.3012 0.3000 1.671 19.24 (νd2)  5* 4.9847 0.5770  6* 20.1661 0.5700 1.639 23.52 (νd3)  7* 37.0941 0.4100  8* 300.0000 0.3800 1.671 19.24 (νd4)  9* 150.0000 0.2000 10* −17.8619 0.5900 1.535 55.69 (νd5) 11* 71.8823 0.3500 12* 2.8991 0.6100 1.535 55.69 (νd6) 13* 12.6423 0.7800 14* 200.0000 0.7400 1.535 55.69 (νd7) 15* 2.7630 0.5000 16 Infinity 0.1100 1.517 64.20 17 Infinity 0.5617 nage Plane Constituent Lens Data Lens Start Surface Focal Length TTL to diagonal length of effective image area 1 2 6.084 0.63 2 4 −19.302 3 6 68.241 4 8 −447.719 5 10 −26.690 6 12 6.884 7 14 −5.245 Aspheric Surface Data 2nd Surface 3rd Surface 4th Surface 5th Surface 6th Surface 7th Surface 8th Surface k −6.559647E−02   3.373606E+00   5.446008E+00 −1.614489E+01   0.000000E+00   0.000000E+00   0.000000E+00 A4 −3.622995E−03 −3.021866E−02 −4.677377E−02 −2.650981E−03 −1.395483E−02 −2.425851E−02   1.450465E−02 A6   1.284925E−02   1.507049E−02   4.052419E−02   1.060651E−02 −1.357462E−02   1.963438E−02 −7.914245E−02 A8 −1.650380E−02   2.168505E−03 −2.709334E−02   1.273388E−02   1.303593E−02 −4.243366E−02   9.353477E−02 A10   1.293473E−02 −6.920340E−03   2.009842E−02 −3.723402E−02   3.447257E−04   4.546734E−02 −7.349787E−02 A12 −6.474105E−03   4.035987E−03 −1.310021E−02   4.430638E−02 −1.328190E−02 −2.840515E−02   3.824283E−02 A14   2.107113E−03 −1.234853E−03   5.934195E−03 −2.999124E−02   1.249145E−02   1.028941E−02 −1.328319E−02 A16 −4.347018E−04   2.200370E−04 −1.646811E−03   1.200049E−02 −5.393915E−03 −2.016579E−03   2.971080E−03 A18   5.170129E−05 −2.249453E−05   2.528897E−04 −2.649370E−03   1.159555E−03   1.661961E−04 −3.876340E−04 A20 −2.775357E−06   1.041022E−06 −1.646062E−05   2.534405E−04 −9.771781E−05   6.585034E−07   2.205833E−05 9th Surface 10th Surface 11th Surface 12th Surface 13th Surface 14th Surface 15th Surface k   0.000000E+00   2.120202E+01   0.000000E+00 −1.015134E+00 −1.330507E+01   0.000000E+00 −8.638365E+00 A4   3.737528E−02   1.150290E−02 −7.054485E−02 −2.728812E−02   3.323277E−02 −6.846539E−02 −3.552604E−02 A6 −6.679671E−02 −2.246164E−02   2.181379E−02   1.745532E−03 −1.382059E−02   2.166921E−02   9.524208E−03 A8   4.539705E−02   1.009500E−02 −6.117806E−03 −1.081321E−03   2.419262E−03 −3.801547E−03 −1.728724E−03 A10 −1.973313E−02 −2.253759E−03   1.679980E−03   2.474103E−04 −2.592460E−04   4.257443E−04   2.036258E−04 A12   5.601224E−03   2.971199E−04 −3.068209E−04 −2.463176E−05   1.813305E−05 −3.142447E−05 −1.560173E−05 A14 −1.000972E−03 −2.401025E−05   3.356292E−05   1.268196E−06 −8.040351E−07   1.523771E−06   7.657150E−07 A16   1.043858E−04   1.167165E−06 −2.138030E−06 −3.393399E−08   2.025658E−08 −4.674747E−08 −2.305663E−08 A18 −5.429864E−06 −3.166609E−08   7.346197E−08   4.090588E−10 −2.137944E−10   8.224522E−10   3.861371E−10 A20   8.963378E−08   3.773506E−10 −1.057438E−09 −1.299859E−12 −1.848109E−13 −6.314240E−12 −2.745359E−12

The imaging lens in Example 12 achieves a ratio of a total track length to a diagonal length of an effective image area of the image sensor of 0.63, and a F number of 1.88. As shown in Table 13, the imaging lens in Example 12 satisfies the conditional expressions (1) to (22).

FIG. 24 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 12. As shown in FIG. 24, each aberration is corrected excellently.

In table 13, values of conditional expressions (1) to (22) related to Examples 1 to 12 are shown.

TABLE 13 Conditional Expressions Example 1 Example 2 Example 3 Example 4 Example 5 Example 6  (1) νd3 25.59 23.52 20.37 20.37 20.37 20.37  (2) (νd2/νd4) × (νd5/νd6) 1.00 1.00 0.80 0.80 0.80 0.80  (3) r12/(T5 + D6) 12.32 12.85 6.95 6.97 7.03 6.93  (4) (D1/f1) × 100 16.198 15.750 5.572 5.537 5.534 5.412  (5) f1/f7 −1.18 −1.14 −1.44 −1.44 −1.44 −1.26  (6) f3/f2 −4.63 −4.28 −1.31 −1.31 −1.34 −1.36  (7) r9/f −2.62 −2.69 −1.40 −1.41 −1.41 −1.36  (8) r12/f6 1.82 1.83 1.28 1.28 1.28 1.19  (9) (D6/f6) × 100 9.13 8.98 15.69 15.62 15.43 14.59 (10) f1/f 0.91 0.93 1.68 1.69 1.70 1.72 (11) f5/f −3.89 −3.99 −1.38 −1.39 −1.38 −1.42 (12) f6/f 1.04 1.05 1.05 1.05 1.05 1.08 (13) f7/f −0.78 −0.81 −1.17 −1.17 −1.18 −1.37 (14) f1/f6 0.88 0.88 1.61 1.61 1.62 1.59 (15) f3/f2/f1 −0.76 −0.70 −0.12 −0.12 −0.12 −0.12 (16) r1/f 0.38 0.38 0.43 0.43 0.43 0.43 (17) r2/D1 9.78 9.93 7.95 7.99 7.93 7.97 (18) r9/ T4 −86.13 −85.11 −16.96 −17.30 −17.25 −16.95 (19) r10/f 10.16 10.57 2.67 2.67 2.61 3.07 (20) r11/T6 3.69 3.74 3.21 3.30 3.45 4.28 (21) r11/f6 0.42 0.42 0.43 0.43 0.43 0.42 (22) r12/(D5 + T5 + D6) 7.83 8.01 5.30 5.30 5.36 5.23 Conditional Expressions Example 7 Example 8 Example 9 Example 10 Example 11 Example 12  (1) νd3 20.37 19.24 19.24 19.24 19.24 23.52  (2) (νd2/νd4) × (νd5/νd6) 0.80 0.80 0.80 0.80 0.80 1.00  (3) r12/(T5 + D6) 6.79 8.69 8.66 8.18 9.41 13.17  (4) (D1/f1) × 100 5.122 5.469 5.459 5.256 5.523 15.615  (5) f1/f7 −1.14 −1.53 −1.53 −1.56 −1.53 −1.16  (6) f3/f2 −1.39 −1.50 −1.50 −1.53 −1.52 −3.54  (7) r9/f −1.08 −0.82 −0.83 −0.86 −0.84 −2.74  (8) r12/f6 1.16 1.87 1.86 1.71 1.82 1.84  (9) (D6/f6) × 100 14.90 18.13 18.12 17.55 16.36 8.86 (10) f1/f 1.80 1.84 1.84 1.91 1.83 0.93 (11) f5/f −1.33 −1.22 −1.22 −1.24 −1.20 −4.09 (12) f6/f 1.10 0.98 0.98 1.00 0.98 1.06 (13) f7/f −1.58 −1.21 −1.20 −1.23 −1.19 −0.80 (14) f1/f6 1.64 1.87 1.87 1.90 1.86 0.88 (15) f3/f2/f1 −0.12 −0.12 −0.12 −0.12 −0.13 −0.58 (16) r1/f 0.43 0.47 0.47 0.47 0.47 0.38 (17) r2/D1 8.00 8.13 8.14 8.11 8.12 9.92 (18) r9/ T4 −13.17 −12.69 −12.73 −13.31 −14.68 −89.31 (19) r10/f 4.91 33.93 32.59 17.16 14.98 11.02 (20) r11/T6 4.91 4.51 4.50 4.53 4.50 3.72 (21) r11/f6 0.42 0.48 0.48 0.47 0.47 0.42 (22) r12/(D5 + T5 + D6) 5.09 6.90 6.87 6.43 6.81 8.16

When the imaging lens according to the present invention is adopted to a product with the camera function, there is realized contribution to the low profile and the low F-number of the camera and also high performance thereof.

DESCRIPTION OF REFERENCE NUMERALS

ST: aperture stop

L1: first lens

L2: second lens

L3: third lens

L4: fourth lens

L5: fifth lens

L6: sixth lens

L7: seventh lens

IR: filter

IMG: imaging plane 

What is claimed is:
 1. An imaging lens comprising, in order from an object side to an image side, a first lens with positive refractive power, a second lens with positive or negative refractive power, a third lens with positive or negative refractive power, a fourth lens, a fifth lens with negative refractive power, a sixth lens with positive refractive power, and a seventh lens with negative refractive power, wherein said first lens has an object-side surface being convex in a paraxial region, said third lens has an object-side surface being convex in a paraxial region, said fifth lens is formed in a biconcave shape having an object-side surface and an image-side surface being concave in a paraxial region, and said seventh lens has an image-side surface being concave in a paraxial region, and the following conditional expressions (1), (2) and (3) are satisfied: 13.00<vd3<34.00  (1) 0.55<(vd2/vd4)×(vd5/vd6)<1.30  (2) 1.50<r12/(T5+D6)<14.00  (3) wherein vd3: an abbe number at d-ray of the third lens, vd2: an abbe number at d-ray of the second lens, vd4: an abbe number at d-ray of the fourth lens, vd5: an abbe number at d-ray of the fifth lens, vd6: an abbe number at d-ray of the sixth lens, r12: a paraxial curvature radius of an image-side surface of the sixth lens, T5: a distance along the optical axis from an image-side surface of the fifth lens to an object-side surface of the sixth lens, and D6: a thickness along the optical axis of the sixth lens.
 2. The imaging lens according to claim 1, wherein an image-side surface of said third lens is concave in a paraxial region.
 3. The imaging lens according to claim 1, wherein the following conditional expression (4) is satisfied: 2.50<(D1/f1)×100<16.20  (4) where D1: a thickness along the optical axis of the first lens, and f1: a focal length of the first lens.
 4. The imaging lens according to claim 1, wherein the following conditional expression (5) is satisfied: −1.75<f1/f7<−0.50  (5) where f1: a focal length of the first lens, and f7: a focal length of the seventh lens.
 5. The imaging lens according to claim 1, wherein the following conditional expression (6) is satisfied: −4.65<f3/f2<−0.25  (6) where f3: a focal length of the third lens, and f2: a focal length of the second lens.
 6. The imaging lens according to claim 1, wherein the following conditional expression (7) is satisfied: −2.75<r9/f<−0.20  (7) where r9: a paraxial curvature radius of an object-side surface of the fifth lens, and f: a focal length of the overall optical system of the imaging lens.
 7. The imaging lens according to claim 1, wherein the following conditional expression (8) is satisfied: 0.80<r12/f6<1.90  (8) where r12: a paraxial curvature radius of an image-side surface of the sixth lens, and f6: a focal length of the sixth lens. 